隧道即将贯通时遭遇塌方，会使贯通面临塌方可靠处理和贯通安全施工双重困难。为保障隧道贯通施工安全，避免塌方，依托江西省昌宁高速公路凤岭隧道在塌方影响下的贯通施工，通过分析研究隧道贯通施工处理过程中的重点和难点，提出综合物理探测、塌方段管棚注浆支护、贯通面合理确定、贯通段管棚注浆支护以及洞身短开挖强支护等系统化的技术方法，并采用三维数值模拟方法对施工过程中围岩、初期支护的应力和位移进行分析，验证施工处理技术的可行性。现场监测结果和处理效果证明，该系统化施工技术体系在塌方影响下的隧道贯通施工是安全有效的。

Great difficulties will occur at tunnel breakthrough when collapse happens. In order to guarantee the construction safety of tunnel breakthrough and to avoid secondary collapse, the key points and difficulties of breakthrough construction of Fengling Tunnel on NanchangNingdu Highway in Jiangxi are analyzed; the systematic processing technologies, including comprehensive geophysical prospecting, piperoof grouting support of collapse section, decision of rational tunnel breakthrough crosssection, piperoof grouting support of breakthrough section and shortdistance excavation and strengthened support of tunnel, are proposed; the stress and displacement of surrounding rocks and primary support during construction are numerically simulated by means of 3D numerical simulation method. The monitoring results show that the technologies used are safe and feasible.